Curt,
 The Arduino analogue inputs provide 1024 level discrimination. 
Translated to +/- 1000Hz that equates to 2Hz steps. I don't know why 
that would be considered not smooth enough?
I sent you the source code by private email yesterday.
Steve G3TXQ
On 26/10/2017 21:49, Curt Benjamin via TenTec wrote:
 
Steve, I've run that idea by a few Arduino guys including AD7C himself. They say yes, you 
can use one of the analog pins and you can "map" the 0-5VDC to say, an offset 
of +/- 1000 Hz but they say it's not smooth enough to use as RIT. I would like to try but 
I don't know enough about writing the code to add that function.
Regarding your PIC controller, I have a PIC ordered so I can copy your circuit. 
I'd rather use an AVR since I have some and also a programmer. Is there any way 
you could port your PIC code to an AVR, or would you be willing to release your 
source code so I can try to do it?
Curt K8AI
 
 
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